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#include <bits/stdc++.h>

using namespace std;
#define Vint vector<int>
#define LL long long

LL n,m,l,r,k;

int main()
{
    ios_base::sync_with_stdio(0);
    cin >> n >> m;
    Vint a(n,-1);
    for(int i=0;i<m;i++){
        cin >> l >> r >> k;
        for(int j=l-1;j<r;j++){
            if(k==1)
                if(a[j]==1 || a[j] == 4 || a[j] == 5 || a[j] == 7)
                    continue;
                else a[j] += (k+1);
            else if(k==2)
                if(a[j]==2 || a[j] == 4 || a[j] == 6 || a[j] == 7)
                    continue;
                else a[j] += (k+1);
            else
                if(a[j]==3 || a[j] == 5 || a[j] == 6 || a[j] == 7)
                    continue;
                else a[j] += (k+1);
        }
    }
    LL c=0;
    for(int i=0;i<n;i++)
        if(a[i]==4)
            c++;
    cout << c;
    return 0;
}